The 16mm classic block offer very high working loads in an extremely small, lightweight block. They are perfect for the new, smaller synthetic control lines found on high-tech dinghies and are the choice for competitve racers.- These diminutive blocks feature a patented bearing system using stainless balls in a captive, grooved race- Stainless steel sideplates - Use for dinghy control lines, spinnaker pole trip lines, big boat leech lines, outhauls, downhauls, cuninghams, traveler controls and halyards on Prams